Where ±0.005mm
is non-negotiable.
Widin ESTAR Series · ESRB712 · 2-Flute Ball Nose Rib Processing End Mills · From 0.1mm Diameter
ESRB712 Range · Sizes from 0.1mm
Widin ESRB712 · Sub-micron carbide · AlTiN nano-coat
Free next-day delivery on orders over £50 ex VAT
SHOP NOW →Precision that performs under pressure
From the pitlane to the operating theatre — the ESRB712 is chosen wherever tolerance, surface finish and repeatable accuracy define the difference between acceptable and exceptional.
Race-specification machining
Suspension uprights, gearbox casings, carbon-fibre backing tools and titanium fastener features — F1 teams demand the sub-micron accuracy the ESRB712 was designed to deliver, every lap.
Structural & engine components
Hard alloy blisk cavities, turbine blade root forms, landing-gear housings — the deep-rib geometry and long-neck range access features that shorter tools simply cannot reach.
Implant & instrument precision
Surgical implants, orthopaedic tooling and instrument bodies require surface finishes that eliminate post-process polishing. The ±0.005mm ball-tip tolerance makes that possible in a single operation.
Deep-cavity mould work
The tool this series was designed for: high-hardness mould steel, deep narrow ribs, freeform 3D surfaces. The 13° neck relief and wide neck-length selection give access others can't match.
Three reasons engineers specify ESTAR
Every aspect of the ESRB712 was engineered to extend tool life, improve surface finish and reduce cycle time in the hardest applications.
Nano AlTiN Coating
A physical vapour deposition (PVD) nano-layer AlTiN coating combines exceptional hardness with heat resistance and adhesion strength. It maintains a sharp cutting edge in hardened materials where uncoated tools fail rapidly — giving measurably longer tool life and better part-to-part consistency.
PVD · AlTiN · Nano-layerSub-micron Carbide Substrate
The fine-grain sub-micron carbide blank provides the hardness and wear resistance base that makes the coating work. Tighter grain structure means a more consistent edge geometry — critical when that edge is 0.1mm across and forming a surface that cannot be re-machined.
Sub-micron grain · HRc 60 ratedLong-Neck Rib Geometry
The 13° neck relief angle and extensive neck-length selection are the defining design features of the ESRB712. Deep ribs, narrow slots, and undercut features are accessible without the tool body contacting the workpiece wall — while maintaining the rigidity needed to hold ±0.005mm ball-tip tolerance.
13° neck relief · Deep groove ratedThe numbers that matter on the shop floor
Works in the materials you actually machine
The AlTiN nano-coat and sub-micron substrate combination covers the full range of steels encountered in precision engineering — from soft carbon through to heat-treated alloys at the limit of machinability.
Browse the full ESRB712 range
Diameters from 0.1mm · Extensive neck-length selection · All in stock for next-day dispatch
SHOP ESRB712 END MILLSFree next-day delivery on orders over £50 ex VAT
Built for the most demanding work your machine can produce.
The Widin ESTAR ESRB712 is a 2-flute solid carbide ball nose end mill engineered specifically for rib and deep-groove machining in hardened workpieces. Every dimensional parameter — from the sub-micron carbide blank to the final coating layer — is optimised for the conditions found in high-hardness mould, die, motorsport and aerospace work.
The ±0.005mm ball-tip tolerance isn't a nominal figure — it's a catalogue standard held across the full range, giving you the confidence to programme directly to nominal without leaving extra stock for post-processing.
SHOP THE FULL RANGEWhy order from Protool?
Stock, speed and technical knowledge — when your machine is running and the tool is the variable.
Day
Free next-day delivery
Orders over £50 ex VAT ship free on next-day DPD. Place before 4:30pm Mon–Fri and we dispatch same day.
Stock
Full range held in stock
We hold the ESRB712 range across the full diameter and neck-length spectrum — no lead time waiting, no minimum order quantities.
Help
Applications support available
Not sure which neck length to specify? Call us on 01732 887334 and our team can advise on the right variant for your setup.
Built for professional buyers
Whether you're a procurement manager at a motorsport team, a works manager at a precision subcontractor, or a buyer placing regular tooling orders — we have the account structure and the supply commitment to work the way you need.
Apply for a credit account
30-day payment terms, a single monthly statement, and purchase orders against your account — the way professional procurement should work.
APPLY ONLINE →Better prices when you log in
Registered trade customers see improved pricing on the ESRB712 range across our full catalogue when logged in.
LOG IN / REGISTER →Bulk orders & scheduled supply
Bulk pricing available on larger quantities. We can also work to a delivery schedule so your tooling arrives exactly when your production programme needs it.
CALL 01732 887334 →Common Questions
Everything you need to know before you order.
±0.005mm. Every tool. Every time.
Widin ESTAR ESRB712 — the rib processing end mill your precision work deserves.
SHOP THE ESRB712 RANGEFree next-day delivery over £50 ex VAT · Technical support: 01732 887334 · Delivery info
